340 vs 360 confirmation

Woodsman341 said
So, if I'm reading this correctly, my 360, using the 340 manifolds, will produce 315hp max, and changing to the awesome (but expensive) TTI headers gives a gain of 12hp. I understand that if I were racing or just looking for bragging rights then sure, TTI headers are the way to go, but typical street use wouldn't make any practical difference. And yeah, I decided a long time ago that if I were going to use headers, it would have to be TTI for fitment, especially their slip-tube design.

I still think that using 340 manifolds on my mild 360 build is the right thing for me, but who knows? I may run into some money later or decide to up the power on the build and go a different way. In any case, I really appreciate the information from all of your perspectives!

Modest gains on milder engines yes. With a large cam high flow head and/or stroker then headers can gain 50 hp or so over manifolds. So how much hp headers gain depends on engine combo.

If you go with TTI exhaust with manifolds then decide later want headers you can pull head pipes out of H pipe and swap in shorty pipes to hook to headers. Thats what I did I used to run 340 manifolds then when orig eng got replaced with stroker eng switched to headers.